<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.7.10/dist/vue.min.js"></script>

</head>

<body>
    <div id="app">
        <label for="inp">
            请输入张三成绩<input type="text" id="inp" autofocus placeholder="请输入成绩" v-model="score">
        </label>
        <p v-show="score !== ''">{{ score >= 90 ? "优秀" : score >= 75 ? "良好" : score >= 60 ? "及格": "不合格" }}</p>
    </div>
    <script>
        new Vue({
            el: "#app",
            data: {
                score: ''
            }
        })
    </script>
</body>

</html>